LM1972 Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute | TIJ.co.jp

LM1972 (供給中) Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute



The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired application.

The performance of a μPot is demonstrated through its excellent Signal-to-Noise Ratio, extremely low (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input signal from the output, providing a minimum attenuation of 96dB. Transitions between any attenuation settings are pop free.

The LM1972's 3-wire serial digital interface is TTL and CMOS compatible; receiving data that selects a channel and the desired attenuation level. The Data-Out pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application.

Key Specifications

Total Harmonic Distortion + Noise:

0.003% (max)

Frequency response:

100 kHz (−3dB) (min)

Attenuation range (excluding mute):

78dB (typ)

Differential attenuation:

±0.25dB (max)

Signal-to-noise ratio (ref. 4 Vrms):

110dB (min)

Channel separation:

100dB (min)


  • 3-wire serial interface
  • Daisy-chain capability
  • 104dB mute attenuation
  • Pop and click free attenuation changes

  • 機能一覧

    他の製品と比較 ボリューム制御 IC メール Excelへダウンロード
    Part number オーダー・オプション Number of channels (#) Power supply (V) Gain & attenuation (dB) THD + N @ 1 kHz (%) Interchannel crosstalk @ 1 kHz (dBFS) Dynamic range (dB) Operating temperature range (C) Package Group
    LM1972 ご注文 2     4.5 to 15     0dB to -78dB with 0.5dB steps     0.0008     -110     115     0 to 70     SOIC | 20